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Description
Eryngium Alpinum Blue Star, also known as Alpine Sea Holly, is a herbaceous perennial plant that belongs to the family Apiaceae. It is native to Europe, where it grows in mountainous regions and along riverbanks. The plant can grow up to 2-3 feet tall and 1-2 feet wide, with a clumping growth habit. The leaves of Eryngium Alpinum Blue Star are basal and deeply lobed, with a silvery-blue color and prickly texture. The stems are sturdy and branched, with spiny bracts that protect the flower heads. The flowers of the plant are small and globe-shaped, with a metallic blue color and spiky appearance. They bloom in mid-summer and last for several weeks, attracting bees and butterflies.
Taxonomic Information
| Domain | Eukarya |
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Apiales |
| Family | Apiaceae |
| Genus | Eryngium |
Appearance
Eryngium Alpinum Blue Star is a striking plant that adds texture and color to any garden. Its silvery-blue leaves and spiky flower heads make it a standout among other perennials. The plant can grow up to 2-3 feet tall and 1-2 feet wide, with a clumping growth habit. The leaves of the plant are deeply lobed and have a prickly texture, which helps protect the plant from herbivores. They are silvery-blue in color, providing a striking contrast to the metallic blue flowers. The stems are sturdy and branched, with spiny bracts that protect the flower heads. The flowers are small and globe-shaped, with a metallic blue color and spiky appearance. They bloom in mid-summer and last for several weeks, providing a source of nectar for bees and butterflies.
Care Guide
Eryngium Alpinum Blue Star is a low-maintenance plant that thrives in full sun and well-drained soil. Here are some tips on how to care for this plant:- Water: The plant should be watered regularly, especially during hot and dry weather. However, it is important not to overwater the plant, as it can cause root rot.- Fertilization: The plant does not require much fertilization, but can benefit from a light application of compost or a balanced fertilizer in the spring.- Soil: The plant prefers well-drained soil that is rich in organic matter. It can tolerate a range of soil types, but does not do well in heavy clay or waterlogged soil.- Sunlight: The plant thrives in full sun, but can tolerate partial shade. It is important to provide the plant with at least 6 hours of direct sunlight per day.- Hardiness Zones: The plant is hardy in USDA zones 3-8, meaning it can tolerate temperatures as low as -40°F.
Common Pests & Diseases
Eryngium Alpinum Blue Star is relatively resistant to pests and diseases, but can be susceptible to the following:- Spider mites: These tiny pests can suck the sap from the plant, causing yellow leaves and stunted growth. They can be controlled with insecticidal soap or neem oil.- Powdery mildew: This fungal disease can cause a white powdery coating on the leaves, which can lead to leaf drop and reduced vigor. It can be prevented by providing good air circulation and avoiding overhead watering.
Habitat
Eryngium Alpinum Blue Star is native to Europe, where it grows in mountainous regions and along riverbanks. It prefers well-drained soil and full sun, but can tolerate partial shade. The plant is hardy in USDA zones 3-8, meaning it can tolerate a wide range of temperatures.
Question and Answer
Q: Can Eryngium Alpinum Blue Star be grown in containers?
A: Yes, the plant can be grown in containers as long as they are deep enough to accommodate the plant’s roots.
Q: How often should Eryngium Alpinum Blue Star be fertilized?
A: The plant does not require much fertilization, but can benefit from a light application of compost or a balanced fertilizer in the spring.
Q: Does Eryngium Alpinum Blue Star attract bees and butterflies?
A: Yes, the plant’s flowers are a source of nectar for bees and butterflies.
Q: Is Eryngium Alpinum Blue Star invasive?
A: No, the plant is not considered invasive and does not spread aggressively.
Related Plants
– Eryngium planum (Blue Eryngo)- Eryngium yuccifolium (Rattlesnake Master)- Eryngium giganteum (Miss Willmott’s Ghost)
References
– “Eryngium alpinum.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=d550.- “Eryngium alpinum ‘Blue Star’.” Plant Finder, www.gardenia.net/plant/eryngium-alpinum-blue-star.- “Eryngium alpinum Blue Star.” White Flower Farm, www.whiteflowerfarm.com/eryngium-alpinum-blue-star.
